(16) باب السُّهُولَةِ وَالسَّمَاحَةِ فِي الشِّرَاءِ وَالْبَيْعِ، وَمَنْ طَلَبَ حَقًّا فَلْيَطْلُبْهُ فِي عَفَافٍ
Narrated Jabir bin `Abdullah:
Allah's Messenger (ﷺ) said, "May Allah's mercy be on him who is lenient in his buying, selling, and in demanding back his money."
Reference: Sahih al-Bukhari 2076
In-book reference: Book 34, Hadith 29
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 34, Hadith 290